An expanded One Health model: Integrating social science and One Health to inform study of the human–animal interface

Policy discussions on zoonotic diseases like Ebola have increasingly been framed by a One Health model: Transmission occurs as a consequence of interactions between people and animals that are becoming more frequent because of environmental changes such as deforestation. Until recently, the discussion focused mainly on the biological and environmental aspects of the model. This paper presents an expanded model that explicitly includes social factors such as norms, community dynamics and settlement patterns and makes the case for increased attention on how these factors affect human–animal interaction in the context of both local and large-scale environmental changes.